On-board network system and program

Abstract

An on-board network system includes at least one processor. Plural relay devices that temporarily retain received data and relay the retained data in descending order of relay priority levels include a first relay device. For each set of data retained at the first relay device, the processor measures a retention duration for which the data is retained without being relayed. Data whose measured retention duration exceeds a predetermined threshold is congested data. A second relay device is a different relay device from the first relay device among the plurality of relay devices, and is capable of relaying the congested data. The processor requests the second relay device to raise the relay priority level of the congested data.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based on and claims priority under 35 USC 119 from Japanese Patent Application No. 2020-135400 filed on Aug. 7, 2020, the disclosure of which is incorporated by reference herein.BACKGROUNDTechnical Field[0002]The present disclosure relates to an on-board network system and a program.Related Art[0003]Japanese Patent Application Laid-Open (JP-A) No. 2018-070121 discloses an on-board network system provided with plural control sections, which are connected to one another by plural circuits and transmit and receive data, and relay devices (Gateway ECUs), which relay data transmitted and received between the control sections.[0004]In this on-board network system, a priority level of transmission is specified in advance for each of date items. When data congestion occurs at a relay device, date items with at least a predetermined priority level are prioritized for relay. Thus, data with high priority levels is transferred wit...

AI Technical Summary

Benefits of technology

The present disclosure is about providing an on-board network system and program that can reduce data transfer delays in a network having multiple relay devices. The system specifies a threshold for the retention duration of each data item, allowing accurate determination of congestion and prioritization of data transfer. The system also allows for the preservation of priority levels for congested data items and ensures that data transfer delays are suppressed effectively. Additionally, the system avoids overloading of individual relay devices by reducing the processing load and eliminating data transmission to unrelated devices, thereby reducing delays and overloading of circuits. Overall, this system improves data transfer efficiency and reduces congestion in on-board networks.

Problems solved by technology

However, according to the technology recited in JP-A No. 2018-070121, when data with a certain priority level is concentratedly received at a relay device, transfer delays for data with that priority level may not be adequately suppressed.

Therefore, even if data is concentrated at a certain relay device and data congestion occurs, data with relatively high priority levels is prioritized and relayed.

When data with a certain priority level is concentratedly received at a relay device, if date items are transferred only on the basis of priority level, it may not be possible to suppress transfer delays of a group of date items with the certain priority level.

Therefore, transfer delays may be suppressed for date items with low relay priority levels, which tend to be vulnerable to data congestion.

Consequently, the duration for which that date item is retained at the first relay device increases, and congestion of that date item is likely to occur.

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